Tube



FIG. 1 is a perspective view of a tube showing my new design;

FIG. 2 is a front view of the present design;

FIG. 3 is a rear view of the present design;

FIG. 4 is a left side view of the present design; and,

FIG. 5 is a top view of the present design. 

CLAIM The ornamental design for a tube, as shown. 